Which statement describes the operation of a reduced pressure principle backflow assembly?

Which statement describes the operation of a reduced pressure principle backflow assembly?

• A. It uses two checks and a relief valve to open and drain when a pressure differential occurs between the two checks
• B. It uses a single check valve
• C. It has no relief valve
• D. The relief valve will open and drain if a pressure differential occurs between the two checks

Answer: (D)

In a reduced pressure principle backflow assembly, two check valves are placed in series with a relief valve between them. The relief valve is the safeguard that vents water to a drain whenever the pressure between the two checks changes by more than a small, built-in differential. If backflow conditions develop or pressures shift so that the intermediate space could allow reverse flow, the relief valve opens and discharges to drain. This keeps the intermediate zone at a controlled pressure and prevents any contaminated water from moving back into the potable supply. So, the description that the relief valve will open and drain if there is a pressure differential between the two checks accurately describes how this device protects the system.

In a reduced pressure principle backflow assembly, two check valves are placed in series with a relief valve between them. The relief valve is the safeguard that vents water to a drain whenever the pressure between the two checks changes by more than a small, built-in differential. If backflow conditions develop or pressures shift so that the intermediate space could allow reverse flow, the relief valve opens and discharges to drain. This keeps the intermediate zone at a controlled pressure and prevents any contaminated water from moving back into the potable supply. So, the description that the relief valve will open and drain if there is a pressure differential between the two checks accurately describes how this device protects the system.